To split up APEIs in_nmi() path, we need any nmi-like callers to always be in_nmi(). KVM shouldn't have to know about this, pull the RAS plumbing out into a header file. Currently guest synchronous external aborts are claimed as RAS notifications by handle_guest_sea(), which is hidden in the arch codes mm/fault.c. 32bit gets a dummy declaration in system_misc.h. There is going to be more of this in the future if/when we support the SError-based firmware-first notification mechanism and/or kernel-first notifications for both synchronous external abort and SError. Each of these will come with some Kconfig symbols and a handful of header files. Create a header file for all this. This patch gives handle_guest_sea() a 'kvm_' prefix, and moves the declarations to kvm_ras.h as preparation for a future patch that moves the ACPI-specific RAS code out of mm/fault.c. Signed-off-by: James Morse <james.morse@xxxxxxx> Reviewed-by: Punit Agrawal <punit.agrawal@xxxxxxx> Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- arch/arm/include/asm/kvm_ras.h | 14 ++++++++++++++ arch/arm/include/asm/system_misc.h | 5 ----- arch/arm64/include/asm/kvm_ras.h | 11 +++++++++++ arch/arm64/include/asm/system_misc.h | 2 -- arch/arm64/mm/fault.c | 2 +- virt/kvm/arm/mmu.c | 4 ++-- 6 files changed, 28 insertions(+), 10 deletions(-) create mode 100644 arch/arm/include/asm/kvm_ras.h create mode 100644 arch/arm64/include/asm/kvm_ras.h diff --git a/arch/arm/include/asm/kvm_ras.h b/arch/arm/include/asm/kvm_ras.h new file mode 100644 index 000000000000..aaff56bf338f --- /dev/null +++ b/arch/arm/include/asm/kvm_ras.h @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 - Arm Ltd + +#ifndef __ARM_KVM_RAS_H__ +#define __ARM_KVM_RAS_H__ + +#include <linux/types.h> + +static inline int kvm_handle_guest_sea(phys_addr_t addr, unsigned int esr) +{ + return -1; +} + +#endif /* __ARM_KVM_RAS_H__ */ diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h index 78f6db114faf..51e5ab50b35f 100644 --- a/arch/arm/include/asm/system_misc.h +++ b/arch/arm/include/asm/system_misc.h @@ -23,11 +23,6 @@ extern void (*arm_pm_idle)(void); extern unsigned int user_debug; -static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr) -{ - return -1; -} - #endif /* !__ASSEMBLY__ */ #endif /* __ASM_ARM_SYSTEM_MISC_H */ diff --git a/arch/arm64/include/asm/kvm_ras.h b/arch/arm64/include/asm/kvm_ras.h new file mode 100644 index 000000000000..5f72b07b7912 --- /dev/null +++ b/arch/arm64/include/asm/kvm_ras.h @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 - Arm Ltd + +#ifndef __ARM64_KVM_RAS_H__ +#define __ARM64_KVM_RAS_H__ + +#include <linux/types.h> + +int kvm_handle_guest_sea(phys_addr_t addr, unsigned int esr); + +#endif /* __ARM64_KVM_RAS_H__ */ diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h index 28893a0b141d..48ded3628a89 100644 --- a/arch/arm64/include/asm/system_misc.h +++ b/arch/arm64/include/asm/system_misc.h @@ -45,8 +45,6 @@ extern void __show_regs(struct pt_regs *); extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd); -int handle_guest_sea(phys_addr_t addr, unsigned int esr); - #endif /* __ASSEMBLY__ */ #endif /* __ASM_SYSTEM_MISC_H */ diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 4165485e8b6e..d61a886afec7 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -662,7 +662,7 @@ static const struct fault_info fault_info[] = { { do_bad, SIGKILL, SI_KERNEL, "unknown 63" }, }; -int handle_guest_sea(phys_addr_t addr, unsigned int esr) +int kvm_handle_guest_sea(phys_addr_t addr, unsigned int esr) { int ret = -ENOENT; diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 7f6a944db23d..673141de1e67 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -27,10 +27,10 @@ #include <asm/kvm_arm.h> #include <asm/kvm_mmu.h> #include <asm/kvm_mmio.h> +#include <asm/kvm_ras.h> #include <asm/kvm_asm.h> #include <asm/kvm_emulate.h> #include <asm/virt.h> -#include <asm/system_misc.h> #include "trace.h" @@ -1647,7 +1647,7 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) * For RAS the host kernel may handle this abort. * There is no need to pass the error into the guest. */ - if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu))) + if (!kvm_handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu))) return 1; if (unlikely(!is_iabt)) { -- 2.16.2 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html